Brock Purdy provides a lot of uplifting traits to the 49ers, but there is a specific one that proves to be the greatest. Brock Purdy has been passing every test put out in front of him. The rookie quarterback continues to prove to be an uplifting player for the 49ers offense. He did it again in the win against the Cowboys despite not having a great numbers game. Still, numbers don’t reveal the whole picture. It especially doesn’t tell the whole story about the greatest trait that Purdy brings to the 49ers. That trait is his demeanor and handling of…